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SALISBURY, Md. (WUSA9) -- Maryland State Fire Marshal is investigating a one-story duplex house fire that claimed one life and left another person in critical condition early Friday morning in Salisbury.

Close to 25 firefighters rushed to a fire that happened at 4:57 a.m. at 413 Patrick Avenue, state fire marshal said.

The two victims were found unconscious and were taken to Peninsula Regional Medical, according to state fire marshal.

William Holdbrook, 66 died and the second victim Mary Holdbrook, 41 is still at the hospital and currently in critical condition, authorities said.

The firefighters were able to control the fire within one hour and 45 minutes, however the couple's dog and cat were killed in the fire, state fire marshal said.

Authorities said the neighbor, Francisco Figueroa, in the other half of the duplex realized there was a fire because of the smoke. An effort was made to get to the couple, however the smoke made it too difficult to get to the victims, state fire marshal said.

The American Red Cross is helping Figueroa, authorities said.

Investigators say the fire started in the master bedroom and caused an estimated $80,000 in damage.

The Wicomico County Bureau is helping with the death investigation. The cause of the fire is still unknown and being investigated, state fire marshal said.

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